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Ella vs Watershed: Comparison and Watershed Alternatives (2026)

Ella and Watershed both measure and report emissions, but Ella is faster to get going and does more of the work. Ella is AI-native ESG software built as an agent: it sets your boundaries, chases colleagues for data, reads bills and drafts SECR, CDP, VSME and EcoVadis outputs. Watershed is built for very large enterprise programmes.

Last updated 28 October 2026 · By Tom Wilford, Founder, Ella

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Ella vs Watershed at a glance

Both are used by sustainability teams to measure and report. The biggest difference is who does the work: with Ella, an AI agent guides you from day one and does the collection and drafting; with Watershed, more of that sits with your team.

Ella vs Watershed at a glance
	Ella	Watershed
Built for	Sustainability teams at large and fast-growing companies	Very large enterprises in North America, Europe and Australia and New Zealand
Getting started	Ella sets your boundaries from how you operate and builds your Scope 1 to 3 data checklist instantly, then walks you through each step	Enterprise implementation after a sales process
How data gets in	Ella sends collect links to data owners, tracks who has not replied and chases them, reads dragged-in bills, receipts and spend exports, and pulls from integrations	API, file upload, bill and PDF scanning, AI data cleaning, supplier engagement
Who does the monthly work	Ella's AI agent: it collects, cleans, calculates and drafts. Your team reviews and approves	Your team, supported by Watershed's experts and AI features
Frameworks	GHG Protocol Scopes 1 to 3, SECR, CDP, carbon reduction and net zero plans, product carbon data, CSRD, VSME, EcoVadis, B Corp	CSRD, ISSB, California SB 253 and SB 261, CDP, Australia's ASRS, PCAF
Expert support	Included: Ella's sustainability team backs every customer	In-house experts and policy team
Pricing and trial	Modular plans by module and company size, with a 14-day trial per module on your own data	Quote only, no free tier or trial

Why teams choose Ella over Watershed

Most sustainability teams we speak to are small compared with the requests landing on them: a CDP disclosure, an EcoVadis reassessment, SECR in the annual report, a customer asking for VSME data. The reporting is rarely the slow part. Getting the data is. Ella is ESG software built as an AI agent around that problem, and it is the most guided way we know to do carbon accounting. You do not start from a blank framework. Ella sets your Scope 1 to 3 boundaries from how your business actually operates, builds the checklist of data you need, and sends collect links to the people who hold it. It tracks who has not replied and chases them, reads the bills, receipts and spend exports they send in any format, maps them to emission factors and calculates activity and spend-based emissions automatically. Every number keeps its source, so the footprint, SECR summary, CDP answers and reduction roadmap all come out of one audit-ready data set. Your team reviews and approves. Our sustainability team is there when you want a second opinion.

Where Watershed may fall short

Watershed is an excellent enterprise platform. These are the points buyers outside the very largest companies tell us matter.

Where Watershed may fall short
What to check	With Watershed	With Ella
Time to value	Enterprise implementation	Boundaries and data checklist on day one
Chasing colleagues	Your team manages requests	Ella sends collect links, tracks gaps and chases
UK requirements	SECR not mentioned on its website	SECR summary built in
EcoVadis and VSME	Not mentioned on its website	Dedicated modules
Trying it first	No free tier or trial	14-day trial per module on your own data

What Watershed does well

Watershed is built for large, complex footprints, with a big emission factor library, AI features for cleaning data and drafting reports, and annual third-party assurance of its methods. Analysts rate it highly, and it took on Emitwise's customers in 2025.

Should you choose Ella or Watershed?

Start from what you need to produce and how much time your team has, then work back to the tool.

Should you choose Ella or Watershed?
If you need	Choose
A guided footprint live in days, not an implementation project	Ella
SECR, CDP, VSME and EcoVadis from one data set	Ella
Data chased from colleagues across sites without your team doing it	Ella
A trial on your own data before procurement	Ella
A global enterprise programme with supplier decarbonisation at scale	Watershed

Watershed alternatives worth a look

If you are comparing Watershed with other platforms, these are the ones that come up most often in our conversations with buyers. For a wider list, see our guide to the best ESG software.

Watershed alternatives worth a look
Platform	Best for
Ella	Sustainability teams that want guidance and the data collection done for them
Persefoni	Financial institutions and a free self-serve start
Sweep	Large European groups reporting under CSRD
Greenly	Carbon programmes with an assigned expert

How we wrote this comparison

We make Ella, so read this with that in mind. Everything we say about Watershed comes from Watershed's own website and public announcements, checked in October 2026. Products change quickly in this market, so confirm details with Watershed before you buy. If you spot something out of date, tell us and we will fix it.

How Ella helps

Carbon accounting software

Scope 1, 2 and 3, SECR, CDP and reduction plans, built from your real bills and invoices.

ESG reporting software

CSRD, VSME and customer ESG requests, with the data collected and cleaned for you.

ESG questionnaire automation

Answers to customer sustainability questionnaires and RFPs, drafted from your evidence.

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Frequently Asked Questions

What is the difference between Ella and Watershed?

Watershed is an enterprise sustainability platform focused on carbon measurement and climate disclosures for very large companies. Ella is ESG software built as an AI agent that guides you from day one and does the collection, cleaning and drafting across carbon, CDP, SECR, CSRD, VSME and EcoVadis.

Is Ella a good Watershed alternative?

Yes. Ella is a strong Watershed alternative for sustainability teams that need SECR, CDP, VSME and EcoVadis alongside carbon, want to be up and running quickly, and want the data collection done for them.

Which is easier to use, Ella or Watershed?

Ella is built to be the more guided option. It sets your boundaries, builds your data checklist, collects the data from colleagues and suppliers and drafts the outputs, so your team reviews rather than assembles. Watershed is a powerful enterprise platform that typically starts with an implementation project.

How much does Watershed cost?

Watershed does not publish prices and has no free tier. Pricing is agreed after a demo.

How much does Ella cost?

Ella is priced by module (Carbon, ESG reporting, EcoVadis, B Corp) and by company size, and every module has a 14-day trial so you can test it on your own data before procurement.

Does Watershed help with EcoVadis?

Watershed's website does not mention EcoVadis. Ella has a dedicated EcoVadis module that reads your scorecard, finds the gaps and drafts the fixes.

Can Ella collect ESG data from colleagues and suppliers?

Yes. Ella sends collect links and data requests, tracks missing responses and chases until people reply, accepts bills, receipts and spreadsheets in any format, and runs surveys for suppliers and colleagues. Every figure keeps a link to the document or reply it came from.

Can I switch from Watershed to Ella?

Yes. Export your existing activity data and reports, drop them into Ella and it maps them to your reporting periods. Most teams run both side by side for one reporting cycle to check the numbers match.